Data Center Cooling Fans & EC Centrifugal Blowers
Server racks, CRAC units and AHUs all share one requirement: the fan must push air through dense, high-resistance paths — filters, coils, cable trays and thousands of small component gaps. That is a static-pressure problem, not just an airflow problem, and it is exactly what SUNXFAN®’s backward-curved EC centrifugal blowers are built to solve.
Why high static pressure matters in data centers
- Dense airflow resistance — a server rack behaves like a heat exchanger with high pressure drop; low-static fans stall and stop moving air.
- BC-series reaches up to 1500 Pa, keeping airflow stable even through deep racks and long duct runs.
- Precise thermal control — 0-10V/PWM & Modbus RTU(RS485) lets the fan ramp with rack inlet temperature instead of running flat-out.
How to choose the right model
- Airflow (m³/h) — size for total kW of heat load (roughly 1 kW ≈ 170–200 m³/h).
- Static pressure (Pa) — the denser the rack and longer the duct, the higher the Pa you need.
- Power architecture — 115V/230V AC for standard racks; 310V/800 VDC for facilities running a central DC bus.
- Speed control — 0-10V/PWM for temperature-driven control, Modbus RTU for BMS integration.
- Redundancy — fan-wall arrays share load so a single failure never interrupts cooling.
Fan Wall vs In-Row Cooling
Two architectures dominate airflow design in modern halls. A fan wall assembles dozens of EC centrifugal fans into a single vertical bank that replaces the large room-based precision air conditioners as the air delivery system; because each fan is an independent module, maintenance means sliding out one unit while the rest keep running. In-row cooling instead sits between the server racks and delivers air horizontally, which shortens the path the cold air has to travel. Whichever way you go, the design leans on the same strengths of EC centrifugal blowers: stepless speed modulation and redundant parallel operation.
Rear Door Heat Exchangers (RDHx)
In a rear door heat exchanger, a water coil is mounted to the back door of the rack, so the fans only have to circulate air inside the cabinet itself. Static pressure stays modest, but the duty profile is demanding: continuous 24/7 running with low noise, because the door sits directly in the white space. EC axial and centrifugal impellers are both used with in-door coils, where variable speed keeps the discharge air matched to the water-side load. Every watt drawn at the door is a watt the coil then has to remove, which is another reason efficiency matters here.
Recommended models
| Scenario | Model | Voltage | Airflow | Static Pressure | Power | Noise |
|---|---|---|---|---|---|---|
| High-static, 115V | BC280A-E092D1-01 | 115 V AC | 1540 m³/h | 550 Pa | 125 W | 71 dB(A) |
| High-static, 230V | BC280A-E092D3-01 | 230 V AC | 1540 m³/h | 715 Pa | 125 W | 71 dB(A) |
| 1800 m³/h rack row | BC280A-E092E3-02 | 230 V AC | 1800 m³/h | 715 Pa | 200 W | 77 dB(A) |
| Quiet 2000 m³/h | BC280B-E092E3-02 | 230 V AC | 2000 m³/h | 460 Pa | 200 W | 65 dB(A) |
| 115V, 1950 m³/h | BC310A-E092D1-01 | 115 V AC | 1950 m³/h | 715 Pa | 160 W | 64 dB(A) |
| 230V, 2100 m³/h | BC310A-E092D3-01 | 230 V AC | 2100 m³/h | 715 Pa | 160 W | 64 dB(A) |
| Max airflow | BC310A-E092E3-02 | 230 V AC | 2500 m³/h | 715 Pa | 240 W | 74 dB(A) |
| 310V DC bus | DG200D-D092B0-01 | 310 V DC | 1050 m³/h | 305 Pa | 120 W | 59 dB(A) |
| 230V, 1300 m³/h | DG200D-E092E3-01 | 230 V AC | 1300 m³/h | 500 Pa | 190 W | 64 dB(A) |
Bottom Line
For standard server racks on 230V AC, the BC280A-E092D3-01 (1540 m³/h, 715 Pa) offers the best balance of static pressure and efficiency. For high-density rows, step up to the BC310A-E092E3-02 (2500 m³/h, 715 Pa). If your facility runs a central DC bus, the DG200D-D092B0-01 (310 V DC) removes the onboard rectifier and shifts conversion heat out of the rack. Tell us your total heat load and power architecture, and we will confirm the exact fan and speed-control configuration.
Last updated: 2026-11-02